What is a SLAG?
A slag is a hard or soft stone waste material formed during the refining or forming of core welding.
Electroslag welding helps to weld very thick materials ranging from 25 mm to 300 mm. The position of weld may be any type, i.e., horizontal or vertical.
Electroslag Welding consists of the following parts and are explained accordingly.
1. Plates to be joined-
It consists of the plates ranging from the mentioned milli meters, for the welding to takes place. They are welded either horizontally or vertically.
2. Wire Feed-
The Electroslag Welding consists of two major segments. One part is electricity and the other part is Slag. So the electricity is supplied from wire feed with the help of external supply.
3. Electron Guide Tube-
This electron guide tube helps to point the electricity at a certain place, where the welding has to be done. This tube is consumable and must be replaced for proper welding to takes place.
4. Molten Slag-
Slag in the molten form is placed in the area where the two plates to be joined are kept. Molten slag plays an important role in the welding of two plates. The welding must be so strong, such that it opposes all the other retaining forces and makes them unite.
This Electroslag Welding uses DC voltage ranging from 40 V to 50 V. This is same as Arc Process, but as the Arc is extinguished it is known as Electroslag Welding.
As shown in the picture, All the three materials namely, Molten Slag, Molten Metal and Coalesced Metal form the weld very firmly with the base of a start plate. The mold used may also be cooled with the help of cold water. This design may be movable and immovable too.
This is the process of Electroslag Welding.
Advantages of Electroslag Welding Process-
- High quality of weld can be obtained.
- The time required for welding process is less.
- The amount of space required for the Electroslag Welding depends on the type of plated used for welding.
- The speed of the weld is 12 mm/min to 36 mm/min.